52 Sir Philip Grcy-Egerton — On some New Pycnodonts. 
2. Ccelodus gykodoides, Egerton. Plate 1Y. Fig. 3. 
The Earl of Enniskillen possesses a fine specimen Qf a Pycnodont 
Yomer from the Greensand of Pinney Bay, near Lyme Begis, 
which, although named Gyrodus new species, I am inclined to refer to 
the genus Ccelodus. It measures two inches and a half in length 
by one inch and seven-tenths at the base and one inch four-tenths in 
front. It carries five rows of tritoral teeth. The central series 
(PL IV. Fig. 3 a ) is composed of eight reniform teeth, six-tentlis of an 
inch long by two-tenths wide. They have an elongated sulcus on 
the anterior face of each tooth similar to those which characterize 
the mandibular teeth of Ccelodus. The adjoining rows on either side 
have nine teeth on the right side (Fig. 3 b) and eight on the left 
(Fig. 3 c). They are considerably smaller than those of the centre 
row and more obtuse. The dep^ession on the grinding surface is 
larger in proportion to the area of the tooth, and each pit has a 
slight papilla at the bottom of the cavity. The two outer rows 
(Fig. 3 d d) contain seven teeth in the right and six in the left. 
These are smaller than those in the adjacent rows and more oval in 
shape, with a slight truncation of the outer margin. These teeth 
might be mistaken for those of Gyrodus, but on comparing them 
with perfect specimens of tliat genus it will be seen that the 
peripliery of the tooth in it is lower than the central boss, and 
tlie crenulation of the projecting ridges more distinct, giving a 
rosette character to the crown, whereas in Ccelodus the marginal 
teeth have more the appearance of pustules with a puckered de- 
pression in the centre. There can be no hesitation in affirming that 
this specimen indicates a new species of Pycnodont. The only doubt 
is whether or not it can be a vomer of Ccelodus ellipticus described 
above. I am inclined to negative this supposition, for the following 
reasons. On applying the vomer to the mandible in the natural 
position, the former appears to be too small for the latter, both 
being evidently adult individuals, and the two are unsuited to bring 
the upper and lower teeth in contact. In those species of Pycnodonts 
where the dentition of both jaws is ascertained, there is a general 
correspondence in the forms and character of the principal teeth ; 
this is not the case here, as the whole dentition differs from that of 
Ccelodus ellipticus in a remarkable degree, and is unlike that of any 
Pycnodont hitherto described. I have not been able to ascertain the 
exact horizon of the bed in which it was found ; the only Informa- 
tion I have is that it was derived from the Greensand of Pinney 
Bay. I propose to call it Ccelodus gyrodoides. 
3. Pycnodus Bowerbanki, Egerton. Plate III. Fig. 2. 
The specific characters of Pycnodus toliapicus given by Agassiz in 
the “ Poissons Fossiles,” vol. ii. pt. 2, p. 196, were taken from a 
single specimen in the collection of Dr. Buckland ; for although he 
alludes to a second example in the museum of Dr. Bowerbank, he 
does not describe it. Some years before Dr. Bowerbank removed 
from London, I had an opportunity of examining bis fine collection 
of Sheppey fishes, in Highbury Grove, and with bis permission made 
